Re: Re: Re: Re: Double Tubas


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Posted by Frederick J. Young on December 07, 2001 at 18:08:44:

In Reply to: Re: Re: Re: Double Tubas posted by js on December 07, 2001 at 08:39:27:

You evidently know what a double tuba is. It works exactly as a double French horn. It has a switch valve that sends air to the appropriate side of the valves. The valves have two full sized sets of slides which are never used together and each have 8 ports. The full double tuba adds or removes a 5 to 8 foot lengths of large tapered tubing between the last valve and the bell to alter the key of the instrument. That usually requires two ganged switch valves. One before the air enters the valves and one after it leaves the valves. As for instruments using numerous four port valves, they usually don't contain anything but cylindrical tubes. An tuba equiped with four port valves would require 11 valves valves in order to get all the steps of the scale in tune. It would not be a double tuba because the valve lowering the instrument would not be of large tapered tubing.


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